Magnetic pump parts structure and fault analysis are excluded, you have collected these pictures.

Regarding the magnetic pump without a dynamic seal and no leakage, the principle and structural characteristics of the magnetic pump are specifically described below, and compared with the shield pump. A detailed introduction to the structure of the magnetic pump components and common troubleshooting analysis.

1. Analysis of parts structure

The structure and composition of the magnetic pump: the magnetic pump consists of three parts: the pump, the magnetic actuator and the motor. The magnetic actuator is composed of an outer magnetic cylinder, an inner magnetic cylinder and a non-magnetic isolation sleeve.

The structure of the magnetic pump is similar. Mainly to see how long the magnetic properties of the magnetic block remain.

At present, there are many magnetic materials available for magnetic pump. Commonly used are ALNICO, ferrite and rare permanent magnet material drill SMCO5 (referred to as 1:5), SM (CO, CU, FE, ZR) 7.4 (referred to as 2:17), ND-FE-B, etc.

Among them, the rare earth permanent magnet material zui is preferred, and the strong zui is the hinged iron boron ND-FE-B. Its zui large magnetic energy product is as high as 28X104T·A/M or more, and the internal coercive force exceeds 1120KA/M, which is favored. However, the operating temperature can not exceed 120 ° C high temperature conditions can be used to drill permanent magnet materials, SM (CO, CU, FE, ZR) 7.4 magnetic energy product is about 192X103T · A / M, its operating temperature can be as high as 300 ° C.

The following are the detailed structures of different types of magnetic pumps commonly found in the market:

1. Shell part: It consists of pump body, pump cover, etc. It bears all the working pressure of the pump; the hydraulic form of the pump body impeller meets the API685 standard, which is the main characteristic part of the hydraulic performance of the magnetic pump. Its function is to force the liquid to rotate. Thereby the mechanical energy of the prime mover is converted into liquid energy.

2. Rotor part: It is divided into rotating parts mounted on the pump shaft and rotating parts mounted on the drive shaft. The pump shaft is an important part that carries the impeller and the inner rotor and transmits torque.

The rotating parts mounted on the pump shaft are composed of an impeller, a bearing, a thrust ring member, an inner magnetic rotor member, and the like, and the pump shaft itself constitutes a rotor portion in contact with the medium. The rotating parts mounted on the drive shaft are composed of an outer magnetic rotor component, a rolling bearing, a drive shaft bushing, and the like, plus a drive shaft itself that constitutes a rotor portion in contact with the air.

3. Connection part: The static connection piece which is connected by the connecting frame and the bearing box. Sliding bearings, bushings and thrust discs: support and positioning parts for pump rotor parts.

4. Transmission part: The pump and the prime mover are connected by diaphragm type extension coupling parts. When repairing, only the intermediate diaphragm of the coupling is removed, and the magnetic pump can be repaired.

5. Inner and outer rotors: The inner and outer rotors are used together to form the magnetic transmission components of the magnetic pump.

6. Isolation sleeve: The isolation sleeve is the only part that can completely realize that the magnetic pump is completely leak-free.

Since the pump shaft is in contact with the medium, the material requirements are corrosion resistance, high processing accuracy, high strength or increased material strength by heat treatment.

The magnetic coupling of the magnetic pump is integrated with the pump body, so the structure is compact, the maintenance is convenient, safe and energy-saving. The magnetic coupling of the pump acts as an overload protection for the drive motor.

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3, failure analysis and elimination

The advantage of the magnetic pump is that it has no leakage, thus completely solving the problem of “running, running, dripping and leaking”.

However, the corresponding magnetic pump has the following disadvantages:

1, the requirements are high

2. If the inlet material is not clean, it is easy to wear the inner magnetic cylinder and the isolation sleeve.

3. The material for the isolation sleeve of the magnetic pump is required to be high.

4. Do not allow the magnetic pump to run without material

5. The efficiency of the magnetic pump is lower than that of the ordinary centrifugal pump.

6, the price is relatively expensive.

7, the scope of use: magnetic pump to the working environment of the pump in the working environment temperature, motor temperature, Zui large working pressure and medium density and particle requirements, etc.

8. Long-term use, even if the mechanical parts are not damaged, it may not be able to continue to use due to the weakening of the magnetic force.

Therefore, the precautions for the use of the magnetic pump are as follows:

(1) After installation, turn the coupling by hand to check for rubbing.

(2) In order to prevent debris from entering the pump, a filter is installed at the inlet of the pump, and the filtering area is larger than 3 to 4 times the cross-sectional area of ​​the pipeline.

(3) It is strictly forbidden to run empty.

(4) The pump with high lift should be equipped with a check valve on the outlet line to prevent the water hammer from being suddenly stopped.

(5) Open the pump program: Open the inlet valve before driving, fill the pump with the liquid to be delivered; close the outlet valve; jog the electric lift to check whether the pump is turning correctly; after the pump starts, the outlet valve should be slowly opened. After the pump has reached normal operation, adjust the outlet valve to the required opening. Test run 5~10MIN, if there is no abnormality, it can be put into operation.

Parking procedure: close the outlet valve; cut off the power supply; close the inlet, clean the inner flow channel of the pump and cut off the power supply when it is not used for a long time.

CQB magnetic pump

Maintenance precautions

(1) The pump shaft is broken.

The material of the pump shaft of CQB magnetic pump is 99% alumina ceramic. The main reason for the broken pump shaft is that the shaft is twisted due to the dry running of the pump. When disassembling the pump, it can be seen that the bearing has worn out and the main way to prevent the pump from breaking is to avoid the empty running of the pump.

(2) Bearing damage.

The material used in the CQB magnetic pump bearing is high-density carbon. If the pump is shut off or there is impurities in the pump, the bearing will be damaged. If the coaxiality between the inner and outer magnetic rotors of the cylindrical coupling is not guaranteed, it will directly affect the life of the bearing.

(3) The pump cannot draw liquid.

The pump can't make the liquid is the fault that the pump is easy to appear, and there are many reasons. First, check the suction line of the pump for leaks. Check whether the air in the suction pipe is exhausted. The amount of liquid poured in the pump is sufficient. If there is any debris in the suction pipe, check whether the pump is reversed. Especially after changing the motor or after the power supply line has been repaired, it should also be noted whether the suction height of the pump is too high. If the above inspection still cannot be solved, the pump can be disassembled and inspected to see if the pump shaft is broken. It should also check whether the moving ring and static ring of the pump are intact, and whether the entire rotor can move in a small amount. If the axial movement is difficult, check if the carbon bearing is too tightly coupled to the pump shaft.

It is worth noting that the pump has been repaired several times and no problem can be found. It should be noted that the magnetic coupling is working properly. The bearings, the inner magnetic rotor and the spacers generate heat during operation, which will increase the operating temperature, on the one hand, the power delivered, and on the other hand, the pump that transports the easily vaporized liquid will cause great trouble. The power transmitted by the magnetic steel is a continuous decreasing curve with the increase of temperature. Generally, below the working limit temperature of the magnetic steel, the drop of the transmission capacity is reversible, and above the limit temperature is irreversible, that is, the magnetic steel is cooled. Afterwards, the lost transmission capacity can no longer be restored. Under special circumstances, when the magnetic coupling is slipped (out of step), the eddy heat in the spacer will increase sharply, and the temperature will rise sharply. If not treated in time, the magnetic steel will demagnetize and the magnetic coupling will be invalid. Therefore, the magnetic pump should be designed with a reliable cooling system. For mediums that are not easily vaporized, the cooling circulation system generally draws out the liquid flow from the impeller outlet or the pump outlet, and returns to the suction population through the bearing and the magnetic transmission part. For the easily vaporized medium, the heat exchanger should be added or the liquid flow should be led outside the pump. The storage tank should avoid heat returning to the population. For media with solid impurities or ferromagnetic impurities, filtration should be considered. For high temperature media, cooling should be considered to ensure that the magnetic coupling does not exceed the working limit temperature.

When considering whether the rotation speed is enough, first check whether the rotation speed of the motor itself is normal. It can be measured by the tachometer. When the motor rotation speed is normal, it can be considered whether the magnetic coupling slips.

(4) Insufficient head.

The causes of such failures are: there is air in the conveying medium, the impeller is damaged, the rotation speed is insufficient, the specific gravity of the conveying liquid is too large, and the flow rate is too large.

(5) Insufficient flow.

The main causes of insufficient flow are: impeller damage, insufficient speed, too high lift, and blockage of debris in the pipe.

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